The Sun reports that George Kay has been arrested after tens of thousands of pounds of jewellery was allegedly stolen in a car jacking in Hertfordshire last month.
The 35-year-old was reportedly arrested on suspicion of conspiracy to commit robbery, and is said to have been bailed until later this month.
Police say three men assaulted the driver of a Mercedes, before fleeing with two bags of jewellery.
A second victim was then ambushed, the attackers fleeing with his Honda, which was then recovered in north London.
Herts Police confirmed to The Sun that a 35-year-old man from Oxfordshire was arrested, along with a further three men, aged 20, 21 and 66.
The alleged incident is said to have taken place just days before the father of Kerry's fifth child George moved back in with the family.
As of Friday morning, neither party has commented on the reports.